This requires the detector to be positioned on the far side of the gas sample, which makes its use in some enclosed or remote environments very difficult.
这要求探测器被放置在气体样本的对面，这使得它在一些封闭或较远的环境里的应用变得十分困难。
The method for recognizing gas zone with PND logging data is introduced, which is to overlap the counting rates of a near detector and a far one to recognize gas zone based on certain scale.
介绍了利用PND测井资料进行气层识别的方法，即利用近探测器计数率和远探测器计数率以一定比例进行重叠的方法识别气层。
It is a great challenge for modern defense technology to detect, track and recognize a target at far range from the detector.
如何在有干扰的情况下，在尽可能远的距离上对目标进行快速检测、精确跟踪和准确识别，是现代防御技术领域面临的重要挑战。
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